From: Sibi Sankar <sibis@codeaurora.org>
To: viresh.kumar@linaro.org, sboyd@kernel.org,
georgi.djakov@linaro.org, bjorn.andersson@linaro.org,
saravanak@google.com, mka@chromium.org
Cc: nm@ti.com, agross@kernel.org, david.brown@linaro.org,
robh+dt@kernel.org, mark.rutland@arm.com, rjw@rjwysocki.net,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
dianders@chromium.org, vincent.guittot@linaro.org,
amit.kucheria@linaro.org, ulf.hansson@linaro.org,
lukasz.luba@arm.com, sudeep.holla@arm.com,
Sibi Sankar <sibis@codeaurora.org>
Subject: [PATCH v4 04/12] OPP: Add and export helper to update voltage
Date: Tue, 5 May 2020 01:52:35 +0530 [thread overview]
Message-ID: <20200504202243.5476-5-sibis@codeaurora.org> (raw)
In-Reply-To: <20200504202243.5476-1-sibis@codeaurora.org>
Add and export 'dev_pm_opp_update_voltage' to update the voltage of an
opp for a given frequency. This will be useful to update the opps with
voltages read back from firmware.
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
v4:
* Function description update [Matthias]
* Drop initialization [Matthias]
* Drop err message on opp_table get failure
drivers/opp/core.c | 51 ++++++++++++++++++++++++++++++++++++++++++
include/linux/pm_opp.h | 10 +++++++++
2 files changed, 61 insertions(+)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index cfad09f5dfffa..7f7060079bb28 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2248,6 +2248,57 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
+/**
+ * dev_pm_opp_update_voltage() - Update the voltage of an opp
+ * @dev: device for which we do this operation
+ * @freq: OPP frequency to update voltage
+ * @u_volt: voltage requested for this opp
+ *
+ * Update voltage of a disabled opp corresponding to the given frequency.
+ * This is useful only for devices with single power supply.
+ *
+ * Return: 0 if modification was successful or a negative error value.
+ */
+int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,
+ unsigned long u_volt)
+{
+ struct opp_table *opp_table;
+ struct dev_pm_opp *opp;
+ unsigned long tol;
+ int ret = 0;
+
+ opp_table = _find_opp_table(dev);
+ if (IS_ERR(opp_table))
+ return PTR_ERR(opp_table);
+
+ opp = dev_pm_opp_find_freq_exact(dev, freq, false);
+ if (IS_ERR(opp)) {
+ ret = PTR_ERR(opp);
+ goto put_table;
+ }
+
+ mutex_lock(&opp_table->lock);
+
+ /* update only if the opp is disabled */
+ if (opp->available) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
+ opp->supplies[0].u_volt_min = u_volt - tol;
+ opp->supplies[0].u_volt = u_volt;
+ opp->supplies[0].u_volt_min = u_volt + tol;
+
+unlock:
+ mutex_unlock(&opp_table->lock);
+ dev_pm_opp_put(opp);
+put_table:
+ dev_pm_opp_put_opp_table(opp_table);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_update_voltage);
+
/**
* dev_pm_opp_register_notifier() - Register OPP notifier for the device
* @dev: Device for which notifier needs to be registered
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index cfceb02904018..639bc0382ee02 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -134,6 +134,9 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
int dev_pm_opp_disable(struct device *dev, unsigned long freq);
+int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq,
+ unsigned long u_volt);
+
int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
@@ -277,6 +280,13 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
return 0;
}
+static inline int dev_pm_opp_update_voltage(struct device *dev,
+ unsigned long freq,
+ unsigned long u_volt)
+{
+ return 0;
+}
+
static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
{
return -ENOTSUPP;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-05-04 20:24 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-04 20:22 [PATCH v4 00/12] DDR/L3 Scaling support on SDM845 and SC7180 SoCs Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 01/12] arm64: dts: qcom: sdm845: Add SoC compatible to MTP Sibi Sankar
2020-05-06 12:32 ` Amit Kucheria
2020-05-04 20:22 ` [PATCH v4 02/12] cpufreq: blacklist SDM845 in cpufreq-dt-platdev Sibi Sankar
2020-05-06 12:32 ` Amit Kucheria
2020-05-04 20:22 ` [PATCH v4 03/12] cpufreq: blacklist SC7180 " Sibi Sankar
2020-05-06 12:33 ` Amit Kucheria
2020-05-04 20:22 ` Sibi Sankar [this message]
2020-05-05 4:45 ` [PATCH v4 04/12] OPP: Add and export helper to update voltage Viresh Kumar
2020-05-05 7:16 ` Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 05/12] OPP: Add and export helper to set bandwidth Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 06/12] cpufreq: qcom: Update the bandwidth levels on frequency change Sibi Sankar
2020-05-05 4:50 ` Viresh Kumar
2020-05-05 7:19 ` Sibi Sankar
2020-05-26 17:48 ` Sibi Sankar
2020-05-27 3:53 ` Viresh Kumar
2020-05-27 4:05 ` Viresh Kumar
2020-05-04 20:22 ` [PATCH v4 07/12] OPP: Add and export helper to get icc path count Sibi Sankar
2020-05-04 22:03 ` Saravana Kannan
2020-05-05 7:36 ` Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 08/12] cpufreq: qcom: Disable fast switch when scaling ddr/l3 Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 09/12] dt-bindings: interconnect: Add interconnect-tags bindings Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 10/12] OPP: Add support for setting interconnect-tags Sibi Sankar
2020-05-05 4:56 ` Viresh Kumar
2020-05-05 7:17 ` Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 11/12] arm64: dts: qcom: sdm845: Add cpu OPP tables Sibi Sankar
2020-05-04 20:22 ` [PATCH v4 12/12] arm64: dts: qcom: sc7180: " Sibi Sankar
2020-05-06 12:38 ` [PATCH v4 00/12] DDR/L3 Scaling support on SDM845 and SC7180 SoCs Amit Kucheria
2020-05-06 14:41 ` Sibi Sankar
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